Electrical isolation of endoscopic video camera
First Claim
1. An electrical isolation circuit for endoscopic video cameras comprising;
- a video camera having a CCD sensor;
an electronic video processing circuit include a plurality of signal lines transmitting signals between said electronic video processing circuit and said video camera;
electrical isolation circuit means interposed between said electronic video processing circuit and said video camera for providing electrial isolation therebetween; and
cable delay compensating means compensating for cable delay of a video signal from said CCD sensor.
1 Assignment
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Accused Products
Abstract
A video camera isolation system and method for use with video cameras that are coupled to endoscopes that utilize simple pulse transformer technology to isolate the video camera head from the video processing circuitry allowing the processing circuitry to be referenced to ground. The video signal from the CCD sensor in the camera head is specifically processed to prevent shutter pulses from interfering with the isolated video signal. Special circuitry blanks the shutter pulse from the pulse transformer. Timing errors due to cable length delays are corrected by means of a pilot signal which correlates with the CCD output signal. Open collector data circuitry is also specially processed by dual channel detecting and amplifying circuits which are transistor switched through the pulse transformers before being delivered to and from the camera head. Timing pulses are processed through logic buffering conditioning circuitry and pulse transformers for reconstruction on the secondary of the pulse transformer by hysteresis buffers. Cable delay compensating is provided by pilot pulse received from a CCD driver that is applied to a correlated double sampling pulse generator having an output to a correlated double sampling circuit to recover the output signal from the CCD sensor. The circuits described allow simple pulse transformer technology to effectively isolate the video camera head connected to an endoscope from the electronic circuitry.
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Citations
29 Claims
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1. An electrical isolation circuit for endoscopic video cameras comprising;
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a video camera having a CCD sensor; an electronic video processing circuit include a plurality of signal lines transmitting signals between said electronic video processing circuit and said video camera; electrical isolation circuit means interposed between said electronic video processing circuit and said video camera for providing electrial isolation therebetween; and cable delay compensating means compensating for cable delay of a video signal from said CCD sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification